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Haul-Out Counts and Photo-Identification of Pinnipeds in Chesapeake Bay and Eastern Shore, Virginia: 2018/2019 Annual Progress Report

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Haul-Out Counts and Photo-Identification of Pinnipeds in Chesapeake Bay and Eastern Shore, Virginia: 2018/2019 Annual Progress Report Haul-out Counts and Photo-Identification of Pinnipeds in Chesapeake Bay and Eastern Shore, Virginia: 2018/2019 Annual Progress Report Prepared by Danielle V. Jones and Deanna R. Rees Naval Facilities Engineering Command Atlantic Norfolk, Virginia March 5, 2020 Suggested Citation: Jones D.V. and Rees, D.R. 2020. Haul-out Counts and Photo-Identification of Pinnipeds in Chesapeake Bay and Eastern Shore, Virginia: 2018/2019 Annual Progress Report. Final Report. Prepared for U.S. Fleet Forces Command, Norfolk, Virginia. 5 March 2020. Cover Photo Credit: Harbor seals (Phoca vitulina) and a gray seal (Halichoerus grypus atlantica) hauled out at a survey site on the Eastern Shore, Virginia. Cover photo by Naval Facilities Engineering Command, Atlantic. Photo taken by Danielle Jones, Naval Facilities Engineering Command Atlantic, under NMFS General Authorization Permit #19826. This project is funded by United States Fleet Forces Command and carried out by Naval Facilities Engineering Command Atlantic as part of the U.S. Navy’s marine species monitoring program Pinniped Haul-out Counts and Photo-ID, Virginia: 2018/2019 Annual Progress Report Table of Contents Acronyms and Abbreviations .................................................................................................iii 1. Introduction and Background .......................................................................................... 1 2. Methods ............................................................................................................................. 2 2.1 STUDY AREA ................................................................................................................. 2 2.2 SURVEY PROTOCOL ....................................................................................................... 5 2.3 PHOTO IDENTIFICATION (PHOTO-ID) ............................................................................... 7 2.4 ANALYTICAL METHODS................................................................................................... 8 2.4.1 Analysis of Seal Presence ......................................................................................... 8 2.4.2 Abundance Estimation ............................................................................................... 9 3. Results ..............................................................................................................................10 3.1 HAUL-OUT COUNTS: 2018/2019 FIELD SEASON .............................................................10 3.2 SEAL PRESENCE ANALYSIS RESULTS.............................................................................11 3.3 PHOTO IDENTIFICATION .................................................................................................14 3.4 ABUNDANCE ESTIMATES ...............................................................................................16 4. Discussion .......................................................................................................................18 5. Conclusions and Recommendations .............................................................................21 6. Acknowledgements .........................................................................................................22 7. References .......................................................................................................................24 List of Appendices Appendix A: Sightings History Tables Figures Figure 1. CBBT and Eastern Shore (ES) haul-out locations and their proximity to U.S. Naval Installations ....................................................................................................................... 3 Figure 2. Aerial view of a CBBT haul-out site. Seals generally haul-out on the tip of the rock armor farthest from the road .............................................................................................. 4 Figure 3. Eastern Shore survey area with harbor seals hauled out on a mud bank .................... 4 Figure 4. Observers used a Carolina skiff (vessel) for the Eastern Shore haul-out counts ......... 5 Figure 5. Average seal count by month using “in season” effort for the CBBT survey area. ......12 Figure 6. Average seal count by month using “in season” effort for the Eastern Shore survey area. .....................................................................................................................13 Final March 2020 | i Pinniped Haul-out Counts and Photo-ID, Virginia: 2018/2019 Annual Progress Report Figure 7. Harbor seal, CB005, captured on 26 February 2016 at the CBBT 3 haul-out site (above) and re-captured on 6 February 2018 at CBBT 3 (below) .....................................16 Figure 8. Total abundance estimates (blue diamonds) and 95% confidence intervals (CIs) for the CBBT and Eastern Shore survey areas combined during each of the field seasons: 2015/2016, 2016/2017, 2017/2018, and 2018/2019 ..........................................17 Tables Table 1. Summary of the number of seals sighted for the 2018/2019 field season for the CBBT survey area ............................................................................................................10 Table 2. Summary of the number of seals sighted for the 2018/2019 field season at the Eastern Shore survey area ...............................................................................................11 Table 3. “In season” survey effort, total seal count (best estimate), max seal count on a single survey, and effort-normalized average (number of seals observed per "in season" survey day) at the CBBT survey area .................................................................13 Table 4. “In season” survey effort, total seal count (best estimate), max seal count on a single survey, and effort-normalized average (number of seals observed per "in season" survey day) at the Eastern Shore survey area ....................................................14 Final March 2020 | ii Pinniped Haul-out Counts and Photo-ID, Virginia: 2018/2019 Annual Progress Report Acronyms and Abbreviations BSS Beaufort sea state CBBT Chesapeake Bay Bridge Tunnel CI Confidence Interval °F degrees Fahrenheit ft feet GA General Authorization for Scientific Research Hg Gray seal (Halichoerus grypus atlantica) km kilometer(s) kts knots m meter(s) min minute MLLW Mean lower low water mm millimeter(s) MMPA Marine Mammal Protection Act NAVFAC LANT Naval Facilities Engineering Command Atlantic NMFS National Marine Fisheries Service NOAA National Oceanic and Atmospheric Administration Photo-ID photo identification Pv Harbor seal (Phoca vitulina) SAR Stock Assessment Report TNC The Nature Conservancy U.S. United States UAS Unmanned aircraft systems UME Unusual mortality event USFF United States Fleet Forces Command VDGIF Virginia Department of Game and Inland Fisheries Final March 2020 | iii Pinniped Haul-out Counts and Photo-ID, Virginia: 2018/2019 Annual Progress Report This page intentionally left blank Final March 2020 | iv Pinniped Haul-out Counts and Photo-ID, Virginia: 2018/2019 Annual Progress Report 1. Introduction and Background Harbor seals (Phoca vitulina) are one of the world’s most widely distributed pinniped species and are found in temperate to polar coastal waters of the northern hemisphere (Jefferson et al. 2015). Gray seals (Halichoerus grypus atlantica) are widely distributed over the continental shelf in cold temperate and sub-polar North Atlantic waters (Lesage and Hammill 2001). There has been some debate in recent years about the southern range extent for harbor and gray seal stocks in the Western North Atlantic. Until 2018, National Oceanic and Atmospheric Administration (NOAA) Stock Assessment Reports (SARs) indicated that the gray seal and harbor seal populations range from New Jersey to Labrador; with scattered sightings and strandings reported as far south as North Carolina for gray seals and Florida for harbor seals (Hayes et al. 2018). Other researchers, report that harbor and gray seal distribution along the United States (U.S.) Atlantic coast appears to be expanding or shifting (DiGiovianni et al. 2011; Johnston et al. 2015; DiGiovianni et al. 2018). This range expansion, especially in the case of the harbor seal, may be due to rapid growth of gray seal populations in Canada and now the Northeastern U.S. (Cammen et al. 2018; Wood et al. 2019). More recently, NOAA SARs indicate the southern extent for the harbor seal population range is now North Carolina. However, the geographic range for the gray seal population, mentioned above, remains the same (Hayes et al. 2019; NOAA NMFS-NEFSC 2019). In Virginia, reports from local anglers and Chesapeake Bay Bridge Tunnel (CBBT) staff (B. Lockwood and B. Biegel pers. comm.) indicated that seals have been using the CBBT rock armor or “islands” to haul out on for many years in increasing numbers. Additionally, annual pinniped stranding numbers have increased in Virginia since the early 1990s (Costidis et al. 2019). In order to verify the distribution of seals in southern Virginia, biologists from Naval Facilities Engineering Command, Atlantic (NAVFAC LANT) have been investigating seal presence in Virginia since 2014. Since this project’s commencement, there have been five dedicated field seasons of research from 2014-2019 and we have expanded the study to include partnerships with HDR, Inc., The Nature Conservancy (TNC), and the Virginia Department of Game and Inland Fisheries (VDGIF). With these partnerships, we were able to increase survey
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